TWI508414B - Rotor and motor using the same - Google Patents

Description

Rotor and motor using the same

The present invention relates to a rotor, and more particularly to a permanent magnet rotor and a built-in motor using the same.

The motor typically includes a rotor and a stator, wherein the stator is a stationary portion for providing a surrounding magnetic field, and the rotor is rotated according to a change in the magnetic field. The conventional rotor is cylindrical. However, the motor of the cylindrical rotor is prone to large noise and vibration during the working process.

In view of the above, it is necessary to provide a motor capable of reducing noise and reducing vibration.

A rotor includes a body and a plurality of permanent magnets built in the body. The outer wall spacer is recessed to form a plurality of grooves extending axially along the body. Each of the grooves includes a bottom surface and two side surfaces connecting the two sides of the bottom surface. The bottom surface is a flat surface, and the two side surfaces are curved surfaces. The body is circumferentially spaced apart and provided with a plurality of accommodating grooves extending along the axial direction of the body. The receiving slot houses at least one of the permanent magnets. The adjacent two receiving slots are respectively located below the bottom surface of the corresponding groove. The two adjacent receiving slots respectively have a side wall, and the two side walls are spaced apart from each other and face each other. The bottom surface of each of the recesses and the two side walls of the two receiving slots adjacent to the bottom surface form a T-shaped portion. The area is such that the area is easily magnetically saturated. The intersection of the bottom surface and the side adjacent to the bottom surface is located at the corresponding permanent magnet The body is adjacent to the sidewall extension line of the bottom surface.

A motor includes a rotor and a stator sleeved on the rotor, the rotor including a body and a plurality of permanent magnets built in the body. The outer wall partition is recessed to form a plurality of grooves extending along the axial direction of the body, each groove includes a bottom surface and two sides connecting the two sides of the bottom surface, the bottom surface is a plane, the two sides are curved surfaces, and the body is wound around the circumference Having a plurality of accommodating grooves extending in the axial direction of the body, each accommodating groove accommodating at least one of the permanent magnets, wherein the adjacent two accommodating grooves are respectively located under the bottom surface of the corresponding groove, and the The two adjacent receiving grooves respectively have a side wall, and the two side walls are spaced apart from each other and face each other. The bottom surface of each of the grooves and the two side walls of the two receiving grooves adjacent to the bottom surface form a T-shaped area. In order to make the area easy to achieve magnetic saturation. The intersection of the bottom surface and the side adjacent to the bottom surface is located on an extension line of the sidewall of the corresponding permanent magnet adjacent to the bottom surface.

The rotor of the present invention and the motor using the same reduce the noise and vibration of the motor during use by designing the shape of the outer contour of the rotor.

100‧‧‧Motor

50‧‧‧Rotor

70‧‧‧ Stator

73‧‧‧ Air gap

51‧‧‧Ontology

53‧‧‧ permanent magnet

5113‧‧‧ bottom

5115‧‧‧ side

5117‧‧‧ connection surface

5118‧‧‧ first intersection

512‧‧‧ Groove

515‧‧‧ accommodating slots

517‧‧‧ 容部

5171‧‧‧First side wall

5173‧‧‧ second side wall

5175‧‧‧ third side wall

5177‧‧‧ fourth side wall

54‧‧‧Area

56‧‧‧Magnetic area

58‧‧‧ pole boots area

1 is a plan view of a motor of an embodiment of the present invention.

Figure 2 is a partially enlarged schematic view of the motor shown in Figure 1.

FIG. 3 is a diagram showing the back electromotive force distribution in an electrical cycle by numerical simulation of the motor and the conventional motor shown in FIG. 1.

FIG. 4 is a diagram showing the output torque distribution obtained during the electrical cycle by numerical simulation of the motor and the conventional motor shown in FIG. 1.

Referring to FIG. 1 , the motor 100 of the embodiment includes a rotor 50 and is sleeved on the rotor 50 . Stator 70. The motor 100 also includes other structures such as a housing, such as an output shaft or the like. In the present embodiment, in order to save space, descriptions of other structures are omitted, and the omitted portions do not affect the technical solution of the present invention.

Referring to FIG. 2 at the same time, the rotor 50 includes a body 51 and a plurality of permanent magnets 53 built in the body 51. The body 51 has a cylindrical structure, and the outer wall is spaced apart to form a plurality of grooves 512 extending axially along the body 51. Each of the grooves 512 includes a bottom surface 5113 and two side surfaces 5115 connecting the two sides of the bottom surface 5113. The bottom surface 5113 is a flat surface, and the two side surfaces 5115 are curved surfaces. The outer wall of the body 51 further includes a connecting surface 5117. Each connecting surface 5117 is connected between two side faces 5115 of the adjacent two grooves 512. In this embodiment, the side surface 5115 is a curved curved surface, and the connecting surface 5117 is a circular arc surface having a radius equal to the radius of the body 51, and the radius of the connecting surface 5117 is smaller than the radius of the side surface 5115. On the cross section of the body 51, the intersection of the bottom surface 5113 and its adjacent side surface 5115 is the first intersection point 5118. It can be understood that the connecting surface 5117 can be set as a symmetrical curved surface, and the vertical distance from the highest point of the connecting surface 5117 to the axis of the body 51 is the radius when the body 51 is a cylinder; the connecting surface 5117 can also be set as other curved surfaces or planes. A plurality of accommodating grooves 515 extending in the axial direction of the body 51 are disposed on the body 51 at intervals in the circumferential direction. The adjacent two receiving slots 515 are respectively located under the bottom surface 5113 of the corresponding recess 512, and the adjacent two receiving slots 515 respectively have a side wall which is spaced apart from each other and faces each other, the bottom surface 5113 and the bottom surface The two sidewalls of the adjacent two accommodating slots 515 of 5113 together form a T-shaped region 54 to make the region 54 susceptible to magnetic saturation. In this embodiment, each of the accommodating grooves 515 is substantially in a "V" shape, and includes two symmetrical and connected accommodating portions 517. Each of the accommodating portions 517 includes a first sidewall 5171, a second sidewall 5173, a third sidewall 5175, and a fourth sidewall 5177. The first side wall 5171 and the second side wall 5173 are disposed substantially parallel to each other, and the third side wall 5175 and the fourth side wall 5177 are respectively located at one end of the first side wall 5171 and the second side wall 5173 away from the other receiving portion 517, and are connected to each other. The third sidewall 5175 is connected to the second sidewall 5173 The fourth sidewall 5177 is connected between the first sidewall 5171 and the third sidewall 5175 between the fourth sidewall 5177 and the fourth sidewall 5177. The third side wall 5175 and the fourth side wall 5177 are disposed substantially perpendicular to each other, and the third side wall 5175 is adjacent to the bottom surface 5113 and substantially parallel to the bottom surface 5113. The first side walls 5171 of the two receiving portions 517 of each of the accommodating grooves 515 are connected and V-shaped, and the second side walls 5173 of the two accommodating portions 517 are connected and substantially "V" shaped. The fourth side walls 5177 of each of the two adjacent receiving grooves 515 are disposed substantially parallel to each other. A substantially "T"-shaped region 54 is formed between each of the bottom surface 5113 and the third side wall 5175 and the fourth side wall 5177 of the two adjacent receiving portions 517 opposite to the bottom surface 5113.

Each of the permanent magnets 53 is received in a receiving portion 517. The permanent magnets 53 placed in the adjacent accommodating grooves 515 are opposite in polarity, and the two permanent magnets 53 located in the same accommodating groove 515 have the same polarity. In order to prevent the magnetic short circuit of the permanent magnet 53 from being generated in the body 51, the volume of the receiving portion 517 is larger than the permanent magnet 53 accommodated in the receiving portion 517, so that the magnetic pole region 56 is formed between the permanent magnet 53 and the sidewall of the receiving portion 517. The magnetic enthalpy 56 is filled with air or a non-magnetic material so that the magnetic flux is not easily distributed in the magnetic ferrule 56. The area between the receiving groove 515 and the outer wall of the body 51 is the pole piece region 58. Since the area of the T-shaped region 54 is relatively small, the magnetic flux density is easily saturated to form a magnetic barrier, and the magnetic flux is concentratedly distributed in the pole piece region 58. In this embodiment, the permanent magnet 53 is substantially elongated. On the cross section of the body 51, the first intersection point 5118 is located on the extension line of the sidewall of the permanent magnet 53 adjacent to the third sidewall 5175.

An air gap 73 is formed between the inner wall of the stator 70 and the body 51. Since the outer wall of the body 51 is provided with a groove 512, the gap between the inner wall of the stator 70 and the body 51 is not the same. The minimum vertical air gap 73 of the connecting surface of the inner wall of the stator 70 and the body 51 is less than the gap of the air gap 73 between the inner wall of the stator 70 and the bottom surface 5113 by about 1.1 mm.

Compared with the conventional rotor having no groove on the outer wall, the motor 100 having the groove 512 is T The area 54 of the type is narrower than the original area, and the magnetic density of the magnetic flux in the region 54 of the T-shape is easily magnetically saturated to form a magnetic barrier, so that the magnetic flux is concentratedly distributed in the pole piece region 58 and transmitted to the stator 70. Since the groove 51 is provided on the body 51, the air gap between the outer wall of the body 51 and the inner wall of the stator 70 is different, and the magnetic flux density is larger in the region where the air gap is smaller. Figure 3 and Figure 4 show the application motor 100 (marked by the solid line in the figure) and the conventional motor (not shown by the dotted line) in the traditional rotor without grooves. The back electromotive force distribution map and the output torque distribution map obtained during the cycle. The numerical analogy results of Figures 3 and 4 are obtained from the finite element software ANSYS software analysis. As seen from FIG. 3 and FIG. 4, the motor 100 provided by the present invention can obtain a more gradual back electromotive force distribution and output torque distribution, that is, the motor 100, compared to a conventional motor using a rotor having no groove on the outer wall. Noise and vibration are reduced. In addition, due to the presence of the magnetic ridge region 56, the magnetic flux does not pass through the magnetic ridge region 56, preventing the permanent magnet 53 from being short-circuited in the body 51, and improving the magnetic flux utilization rate.

The rotor 50 of the present invention and the motor 100 using the rotor reduce the noise and vibration of the motor 100 during use by designing the shape of the outer contour of the rotor 50.

It can be understood that the accommodating groove 515 can be disposed in other shapes, such as a slot pattern, and only the bottom surface 5113 and the side wall of the two accommodating grooves 515 adjacent to the bottom surface 5113 can be surrounded by a substantially T-shaped area 54. At least one permanent magnet 53 is accommodated in the accommodating groove 515.

It can be understood that the first sidewall 5171 and the second sidewall 5173 may not be disposed in parallel, and the fourth sidewall 5177 and the third sidewall 5175 may not be disposed perpendicular to each other, that is, every two adjacent bottom surfaces 5113 and two adjacent third sidewalls 5175 And a T-shaped region may be formed between each of the adjacent fourth sidewalls 5177.

It can be understood that the size of the accommodating portion 517 can be just adapted to receive the permanent magnet 53, that is, the performance ratio There is no motor provided with the magnetic boring zone 56.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

70‧‧‧ Stator

73‧‧‧ Air gap

5113‧‧‧ bottom

5115‧‧‧ side

5117‧‧‧ connection surface

5118‧‧‧ first intersection

512‧‧‧ Groove

515‧‧‧ accommodating slots

517‧‧‧ 容部

5171‧‧‧First side wall

5173‧‧‧ second side wall

5175‧‧‧ third side wall

5177‧‧‧ fourth side wall

54‧‧‧Area

56‧‧‧Magnetic area

58‧‧‧ pole boots area

Claims (9)

A rotor comprising a body and a plurality of permanent magnets embedded in the body, wherein the outer wall is recessed to form a plurality of grooves extending along the axial direction of the body, each groove comprising a bottom surface and two sides connected to the bottom surface The two sides are planar, and the two sides are curved surfaces, and the body is circumferentially spaced apart from the plurality of receiving slots extending along the axial direction of the body, and each of the receiving slots receives at least one of the permanent magnets, wherein The two adjacent receiving grooves are respectively located below the bottom surface of the corresponding groove, and the adjacent two receiving grooves respectively have a side wall which is spaced apart from each other and faces each other, and the bottom surface of each of the grooves The two sidewalls of the two adjacent receiving grooves of the bottom surface together form a T-shaped region, so that the region is easily magnetically saturated, and the intersection of the bottom surface adjacent to the bottom surface is located at the side wall of the corresponding permanent magnet adjacent to the bottom surface. Extend the line. The rotor of claim 1, wherein the accommodating groove comprises two symmetrical and communicating accommodating portions, the two accommodating portions constituting a V structure, and the two accommodating portions of the accommodating groove are respectively adjacent to the accommodating groove The accommodating portions of the accommodating grooves are adjacent to each other, and the side walls of each of the T-shaped regions are formed by the bottom surface of the corresponding groove and the side wall of the two accommodating portions adjacent to the bottom surface but belonging to different accommodating grooves, each of which The permanent magnet is housed in the portion. The rotor of claim 2, wherein each of the accommodating portions includes a first side wall, a second side wall, a third side wall, and a fourth side wall, the third side wall connecting the second side wall and the fourth side wall, The third side wall is adjacent to the corresponding bottom surface and is parallel to the bottom surface. The first side wall is opposite to the second side wall, and the third side wall and the fourth side wall are respectively located at the first side wall and the second side wall away from the other side. One end of the part is connected to each other, and the first side walls of each of the accommodating grooves are connected to form a V-shaped structure, and the second side walls of each of the accommodating grooves are connected to form a V-shaped structure, and each of the two adjacent sides is connected The fourth side wall of the groove is arranged in parallel, and the T-shaped area is surrounded by the bottom surface, two third side walls adjacent to the bottom surface, and two fourth side walls adjacent to the bottom surface, the intersection point Located on a sidewall extension of the permanent magnet adjacent to the third sidewall. The rotor of claim 3, wherein the third side wall of each of the accommodating portions is perpendicular to the fourth side wall. The rotor of claim 3, wherein the first side wall of each of the accommodating portions is parallel to the second side wall. The rotor of claim 2, wherein each of the accommodating portions has a larger volume than the permanent magnets accommodated in the accommodating portion, and each of the permanent magnets and the sidewall of the corresponding accommodating portion form a magnetic ridge region. A motor comprising a rotor and a stator sleeved on the rotor, the rotor comprising a body and a plurality of permanent magnets embedded in the body, wherein the outer wall of the body is recessed to form a plurality of grooves extending along the axial direction of the body, Each of the grooves includes a bottom surface and two side surfaces connecting the two sides of the bottom surface. The bottom surface is a flat surface, and the two side surfaces are curved surfaces. The body is circumferentially spaced apart and provided with a plurality of accommodating grooves extending along the axial direction of the body. The accommodating slot houses at least one of the permanent magnets, wherein the adjacent two accommodating slots are respectively located under the bottom surface of the corresponding recess, and the adjacent two accommodating slots respectively have a side wall, and the two sidewalls are spaced apart from each other Oriented toward each other, the bottom surface of each of the grooves and the two side walls of the two accommodating grooves adjacent to the bottom surface form a T-shaped region, so that the region is easily magnetically saturated, and the bottom surface is adjacent to the bottom surface. The intersection of the sides is located on the extension line of the side wall of the corresponding permanent magnet adjacent to the bottom surface. The motor of claim 7, wherein the inner wall of the stator forms an air gap with each of the bodies, the outer wall further comprising a connecting surface connected between two sides of the two adjacent grooves, The minimum vertical spacing between the inner wall of the stator and the connecting surface is less than about 1.1 mm between the inner wall of the stator and the bottom surface. The motor of claim 7, wherein the accommodating groove comprises two symmetrical and communicating accommodating portions, wherein the two accommodating portions constitute a V-shaped structure, and the two accommodating portions of the accommodating groove are respectively adjacent to the accommodating portion The accommodating portions of the accommodating grooves are adjacent to each other, and the side walls of each of the T-shaped regions are formed by the bottom surface of the corresponding groove and the side wall of the two accommodating portions adjacent to the bottom surface but belonging to different accommodating grooves, each of which Containment There is one such permanent magnet.